Blue Flame 10,000 BTU Natural Gas Vent Free heater is the perfect supplemental heating solution even on the coldest days. The unit is equipped with a multi-output valve for easy temperature regulation and a convenient Piezo ignition built right into the rotation of the knob for one handed ignition. It can be permanently mounted to the wall or securely fastened to the floor with included mounting brackets and fasteners. The clean burning blue flame tube burner uses the natural convection of the burn to circulate warm comfortable air. With a factory standard Oxygen Depletion Sensor (ODS), rest assured this heater will provide you with years of comfortable and safe heat. 10,000 BTU per hour. For use with Natural Gas. Heats up to 250 sq. ft. Blue flame burner for even convection heat. Automatic low oxygen shut-off system (ODS). Legs and wall mounting hardware included. 4500 ft high altitude restriction.